89 lines
2.4 KiB
C++
89 lines
2.4 KiB
C++
/*
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ARGUMENT-ERASURE.hpp - helper for passing on a dynamic typed argument tuple
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Copyright (C) Lumiera.org
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2009, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef CONTROL_ARGUMENT_ERASURE_H
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#define CONTROL_ARGUMENT_ERASURE_H
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#include "lib/error.hpp"
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namespace proc {
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namespace control {
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LUMIERA_ERROR_DECLARE (INVALID_ARGUMENTS); ///< Arguments provided for binding doesn't match stored command function parameters
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/**
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* Adapter interface for invoking an argument binding for a command
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* \em without the need to disclose the concrete types and number of arguments.
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* At the receiver side, the concrete type can be restored by a dynamic cast.
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* This requires the receiver somehow to know the desired argument types;
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* usually this receiver will be an implementation object, whose exact
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* type has been erased after definition, while the implementation
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* internally of course knows the type and thus can perform an
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* dynamic cast on the passed on argument tuple
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*/
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struct Arguments;
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template<typename TUP>
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struct TypedArguments;
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struct Arguments
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{
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virtual ~Arguments() {}
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template<typename TUP>
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TUP const&
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get ()
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{
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TypedArguments<TUP>* dest = dynamic_cast<TypedArguments<TUP>*> (this);
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if (!dest)
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throw lumiera::error::Invalid("Wrong type or number of arguments"
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, LUMIERA_ERROR_INVALID_ARGUMENTS);
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return dest->args_;
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}
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};
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template<typename TUP>
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struct TypedArguments
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: Arguments
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{
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TUP const& args_;
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TypedArguments (TUP const& a)
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: args_(a)
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{ }
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};
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}} // namespace proc::control
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#endif
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